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SUMMARY OF CURRENT RESEARCHES RELATING TO 
accessories, and they were worthily shown at the Paris Photographic 
Convention last September, but here the large photomicrographic 
camera is absent, and its place is supplied by a small and ill-constructed 
one. The stands are badly arranged, and the objectives are limited to 
a single series shut up in a case. There are, however, a few novelties, 
one being a stand with a stage nearly 6 by 9 in., for examination of 
sections across a whole brain and the like, and another being specimens 
of “ palladiumized ” stand or of brass plated with palladium. They 
resemble oxidized brass and give a fine effect. Yion Freres have a large 
number of cheap stands, Teigne and Moreau show a few of the con- 
ventional forms, and J. Duboscq, the well-known instrument-maker, 
exhibits a fine vertical and projecting Microscope. 
Italy also appears in the list with a case of stands and objectives 
manufactured by F. Koristka of Milan. The objectives include an 
apochromatic of 2 mm. of 140 N.A., but both lenses and stands are a 
close and servile imitation of German patterns. 
But by far the most scientific display of Microscopes and accessories 
of all kinds at the Fair, is that of the famous Zeiss establishment of 
Jena. It is located in the north-west portion of the gallery in the 
Electricity Building with the exhibit of the German Society for 
Mechanics and Optics of Berlin, the Society not being able to get the 
necessary space in the Liberal Arts Buildings. There seems to be 
something of the proverbial “ yankee ” energy and push in the way the 
Zeiss business is conducted, and it is shown in the exhibit. Every 
kind of instrument made by the firm is to be seen here, from the simplest 
hand-lens to the most complex outfit for photomicrography and complete 
sets of achromatic and apochromatic objectives. 
In the way of stands there is nothing specially new which has not 
been exhibited for several years, but there are some novelties in 
accessories. One is a mechanical stage, square in form, attached to the 
main stem of the instrument and removed by unscrewing a screw and 
raising a bar. It could be easily attached to almost any instrument and 
ought to offer a good hint to American makers. The photomicrographic 
apparatus is very complete, and has many peculiarities. The tube of 
the Microscope is very wide (50 mm.) and only 3 in. long, but has 
of course a draw-tube. The camera is designed to be used with electric 
light, and a beautifully designed lamp for the arc light is attached. The 
whole apparatus with achromatic condenser, monochromatic light attach- 
ment, centering apparatus, stand, camera, &c., costs 500 dollars in 
Germany or 750 dollars with duty and freight paid. There are other 
interesting specimens in the exhibit, such as the microspectroscope, the 
microspectral photometer for quantitative microspectrum analysis, the 
microspectral objective for observing and measuring the effects of the 
colours of the spectrum on microscopical objects, the spectropolarizer 
for determining the character of double refraction in microscopical 
specimens for particular wave-lengths, and the refi actometer for deter- 
mining the refractive index of glass and liquids. 
F. W. Schieck of Berlin, one of the oldest Microscope-makers in 
Europe, makes a neat exhibit of cheap instruments, two of them being 
of an old pattern, rarely seen at present. One of these is designed to 
have the specimens mounted on a large circular glass which are 
successively seen by revolving the glass. This form is sometimes used 
